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The case of the spotty disbondment in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 8 (08/2017)
[article]
Titre : The case of the spotty disbondment Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 14-19 Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Décollement cathodique (revêtement)
Epoxydes
Expertises
Haut extrait sec
Métaux -- Revêtements protecteurs
Réservoirs (récipients)
Réservoirs (récipients) -- revêtements protecteurs
Revêtements -- Défauts:Peinture -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : The author examined a tank of the floating-roof some 100 feet in diameter and hidden a mile off a two-lane blacktop. It was a vivid white storage tank and showed bright in stark and gleaming contrast to the head-high, green corn and golden silk of the ears.
The facility was spotless and cleaned and the tank was vented.
The tank interior was pristine but for the various areas of peeling and otherwise distressed paint.
The tank was designed to store wastewater mixed with petroleum byproducts. The exact contents were not revealed but it was a unique blend and no one knew quite how the material would interact with the coating system.
It was reported that the epoxy coating system had been installed six years earlier and purported to be high-solids (greater than 98 percent) applied at approximately 20 mils. There were discrepancies as to whether a primer was used during the initial install and whether or not repairs had taken place during the application. One account indicated that during the initial application some large areas on the floor were too thin and the material was re-sprayed.Note de contenu : - Signs of trouble
- The visual inspection
- Getting up close and personal
- Surface prep
- Solving in the mystery
- Do you know ?
- The awner(s)
- Problem number one, two and three
- Recommendations
Fig. 1. The epoxy is clearly peeling away from the substrate. All figures courtesy of the author unless otherwise noted
Fig. 2. The scalloped area highlighted by the blue area shows evidence of good adhesion
Fig. 3. In some areas of the tank floor, the chips of coating coming off were dirty on the bottom side
Fig. 4. In some areas of the tank floor, the chips of coating coming off were clean on the bottom side
Fig. 5. Stills from a video that show areas of disbondment and poor adhesion found sporadically throughout the tank
Fig. 6. The football-shaped, damaged sections exhibiting a cohesive failure were only found in areas such as lap welds, the sump lip and slightly raised sections of the tank floor
Fig. 7. Stills from a second video show the disbonded coating coming off where the back side of the coating appears to be contaminated with dirt, or more likely, with dust from blasting
Fig. 8. The steel substrate in the failing areas examined had a peened, crater-like profile (left) and not an angular one as was required (right)En ligne : http://www.paintsquare.com/archive/index.cfm?fuseaction=view&articleid=6105 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29162
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 8 (08/2017) . - p. 14-19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19078 - Périodique Bibliothèque principale Documentaires Disponible The effect of ultraviolet-curable water-borne polyurethane acrylate binder concentration on the printing performance of synthetic leather / Gülçin Baysal in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
[article]
Titre : The effect of ultraviolet-curable water-borne polyurethane acrylate binder concentration on the printing performance of synthetic leather Type de document : texte imprimé Auteurs : Gülçin Baysal, Auteur ; Berdan Kalav, Auteur ; Burcak Karaguzel Kayaoglu, Auteur Année de publication : 2019 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Copolymère uréthane acrylate
Cuir synthétique imprimé
Dureté (matériaux)
Formulation (Génie chimique)
Haut extrait sec
Liants
Photoréticulation
Polymères en émulsion
Rayonnement ultraviolet
Résistance à l'abrasion
Résistance au chocs
Revêtements en phase aqueuse
Sérigraphie
Solidité de la couleurIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, synthetic leather samples were screen printed with pigmented pastes including two types of photoinitiators and three different concentrations of ultraviolet (UV)-curable water-borne polyurethane acrylate binder. The curing process was conducted under different combinations of lamps (gallium, mercury, gallium/mercury and gallium/gallium/mercury) at three power levels. Abrasion resistance, crock fastness, hardness and colour strength were investigated. Chemical changes in the clear and pigmented film structures because of UV curing were analysed by Fourier Transform-infrared spectroscopy measurements. In hardness measurements, the highest hardness values were obtained with clear and pigmented formulations which have the highest solid content (57%). In colour measurements, higher K/S values were obtained in samples printed with the formulation having a binder concentration of 46%. Wet crock fastness values improved as the energy level increased during curing, and the highest values were obtained with a formulation which had a binder concentration of 57%. Greater amounts of binder in the formulations and increased amounts of energy applied to the surface during curing increased the hardness value of the prints, thus better abrasion resistance was obtained. Overall results suggested that the highest hardness, crock fastness and abrasion resistance values were obtained with the formulation with a binder concentration of 57%. However, for ease of application, printing efficiency and colour strength, the formulation with a binder concentration of 46% is recommended for printing, and curing under consecutive passes with gallium and mercury lamps at 120 W/cm is proposed in terms of energy efficiency and printing performance. Note de contenu : - EXPERIMENTAL : Materials - Methods
- RESULTS AND DISCUSSION : UV curing and pendulum hardness measurements
- Fourier transform infrared (FTIR) spectroscopy - Colour measurements - Crock fastness of printed synthetic leather samples - Martindale abrasion resistance measurements of printed synthetic samplesDOI : 10.1111/cote.12382 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12382 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32324
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 111-120[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20869 - Périodique Bibliothèque principale Documentaires Disponible Thin-film protection for plastics / Philippe de Groote in EUROPEAN COATINGS JOURNAL (ECJ), N° 10 (10/2013)
[article]
Titre : Thin-film protection for plastics : High solids solvent-free and sprayable waterborne UV hardcoat resins Type de document : texte imprimé Auteurs : Philippe de Groote, Auteur ; Michel Tielemans, Auteur ; Johnny Zhang, Auteur ; Marcus Hutchins, Auteur Année de publication : 2013 Article en page(s) : p. 20-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs
Dureté (matériaux)
Formulation (Génie chimique)
Haut extrait sec
Matières plastiques -- Revêtements protecteurs
Polyacrylates
Polyuréthanes
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Two new acrylate-functional UV curing emulsion resins for plastic hardcoats have been produced via a emulsification process, one being a hardcoat resin, the other being its flexibilizing partner. The hardcoat resin outperformed the commercial UV-PUD and solventborne resins it was compared with, and was also beneficial in blends with UV polyurethane dispersions. Further, the flexibility of the hardcoat resin could be fine-tuned by blending with the flexibilizing resin which is miscible in all proportions. Note de contenu : - Properties of the resins tested
- Table 1 : Waterborne UV formulations
- Description of additives used
- Substrates, applications and tests
- New resin passes initial benchmarking tests
- New resin is also beneficial in blends
- More flexible hardcoats are evaluated
- Performance enhancements in summaryEn ligne : https://drive.google.com/file/d/1z78N5VGDD62X6okmyhCYgASEfFiXQI0m/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19501
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2013) . - p. 20-25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15582 - Périodique Bibliothèque principale Documentaires Disponible Toward solventless liquid coatings / Frank N. Jones in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 852 (01/1996)
[article]
Titre : Toward solventless liquid coatings Type de document : texte imprimé Auteurs : Frank N. Jones, Auteur Année de publication : 1996 Article en page(s) : p. 25-36 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides carboxyliques
Diester
Diols
Formulation (Génie chimique)
Haut extrait sec
Liants
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Oligomères
Polyesters
Polyisocyanates
Revêtements
Rhéologie
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Results of an exploratory study of solventless (100% reactive) liquid polyester/ melamine resin and polyester/polyisocyanate coatings are described. An investigation of how the chemical structure and the molecular shape of oligomeric polyester resins affects their viscosities found that slender molecules have very low viscosities. Linear oligoester diols composed entirely of diacids and diols of the structures HOOC (CH2)nCOOH and HO(CH2)mOH with Mn of 700 or below have viscosities below 800 mPa.s at 25°C, low enough for potential use in solventless coatings. Physical properties of oligoester diols were studied, and quantitative relationships among viscosity (η), temperature (T), molar mass (Mn), glass transition temperature (Tg), and melting point (Tm) were demonstrated. The next step was to formulate solventless coatings with linear oligoester diols. An arbitrary goal was to keep viscosity below 800 mPa.s at 25°C without adding organic solvents. A two-package solventless coating made from a linear oligoester diol and a low viscosity polyisocyanate crosslinker had a viscosity of 560 mPa.s at 25°C and excellent film properties; its VOC was 8 g/L. Polyester/melamine resin coatings with similar viscosities can be formulated, but their coating films tend to be soft and to have poor adhesion to metal. Film properties can be improved by adding hardeners to the formulations, but viscosity increases. Viscosity of these solventless formulations can be further reduced by adding modest amounts of water (3 to 20 wt%). This expedient makes it possible to formulate one-package water-thinnable solventless coatings with reasonably good film properties from combinations of linear oligoester diols, hardeners, and melamine resins. Two-package coatings containing polyisocyanate crosslinkers can also be thinned with water with little effect on pot life. Note de contenu : - LOW-VISCOSITY POLYESTER RESINS : Background - Oligomers based on terephthalic acid and diols of structure HO(CH2)nOH - Linear oligomers based on dicarboxylic acids of structure HOOC(CH2)mCOOH and diols of structure HO(CH2)nOH - Synthesis of linear oligomers - Physical properties of linear and non-linear oligoester diols
- FORMULATING WITH LINEAR OLIGOESTER DIOLS : Solventless coatings - Water-thinnable solventless coatingsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18308
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Code-barres Cote Support Localisation Section Disponibilité 003513 - Périodique Bibliothèque principale Documentaires Disponible 003522 - Périodique Bibliothèque principale Documentaires Exclu du prêt Two-component high-solid polyurethane coating systems based on soy polyols / Vijay M. Mannari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 2 (04/2006)
[article]
Titre : Two-component high-solid polyurethane coating systems based on soy polyols Type de document : texte imprimé Auteurs : Vijay M. Mannari, Auteur ; John L. Massingill, Auteur Année de publication : 2006 Article en page(s) : p. 151-157 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biopolymères
Composés organiques volatils
Dureté (matériaux)
Haut extrait sec
Polymères ramifiés
Polyols
Polyuréthanes
Résistance à l'abrasion
Revêtements -- Propriétés mécaniques
Soja et constituants
UrethanesIndex. décimale : 667.9 Revêtements et enduits Résumé : Soybean oil based polyols-soybean oil phosphate ester polyols (SOPEPs)-having varying hydroxyl content and viscosity were prepared as low cost and low-VOC polyols for coatings applications. These SOPEPs were used as the hydroxyl component of "two-component polyurethane (2K-PU)" coating compositions and their film properties were studied. Blends of commercial polyester polyol and SOPEP in varying proportions were also used to formulate PU coatings. Their film properties were studied and compared. We found that SOPEP can be used as the sole hydroxyl component or as the reactive diluent for polyester polyols in 2K-PU coating systems. SOPEP is derived from a relatively inexpensive and renewable resource and the use of SOPEP can substantially reduce VOC and cost ofPU coating formulations. DOI : 10.1007/s11998-006-0018-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0018-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3706
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Code-barres Cote Support Localisation Section Disponibilité 004551 - Périodique Bibliothèque principale Documentaires Disponible Ultra-high solid industrial corrosion protection / Ingo Wolf in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 12, N° 1 (2019)
PermalinkUltra-high-solid paints for industrial applications / Sascha Kollbeck in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 9, N° 2 (2016)
PermalinkUltra high solids copolymer emulsion for demanding applications / Mary L. Hausman in ADHESIVES AGE, Vol. 38, N° 11 (10/1995)
PermalinkUltra-low viscosity oxazolidine and aldimine-based reactive diluents for high-solids polyurethane coatings / Thomas L. Johnson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 849 (10/1995)
PermalinkPermalinkUse of spiro-orthosilicates as blocked polyols/reactive diluents in high-solid PUR clear coats for car refinish applications / K. J. van der Berg in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B4 (12/2006)
PermalinkUseful tips for spraying high-solids coatings in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 6 (06/2016)
PermalinkVersatile and environmentally friendly / William Corso in EUROPEAN COATINGS JOURNAL (ECJ), N° 1 (01/2015)
PermalinkViscosity reduction via monomer selection in solvent-borne high-solids styrene/acrylic coating resins / Charles A. Zezza in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 856 (05/1996)
PermalinkVolatile methylsiloxanes as exempt solvents in protective coatings / William A. Finzel in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 852 (01/1996)
PermalinkWater-based energy curable polyurethane dispersion / Michel Tielemans in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4614 (11/2015)
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